Elgin Factory Mainspring for 4/0s No. 4789 - Steel

Elgin Factory Mainspring for 4/0s movements, Factory No. 4789, steel, new in envelope. See image for further details. Elgin mainsprings are typically coated in very old grease and must be cleaned before use. I have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item